... also called a soundwall, sound berm, sound barrier, or acoustical barrier) is an exterior structure designed to protect sensitive land uses from noise ... times that of glass, 20-30 times of PMMA sheet Light transmission: 80%-90% for different thickness of clear colorUV ... 6mm--29dB,8mm--31dB,10mm-32dB 12mm--34dBApplications: 1) Roofing light sheet and sunshade for office building, department store, hotel, ...